package com.lengjing.project.component;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Description :
 * @Author : ChenYao
 * @Version : 1.0
 * @Create : Date Time: 2018/6/26 12:49
 * @Update : Date Time: 2018/6/26 12:49
 * @see :
 */
public class LoginHandleInterceptor implements HandlerInterceptor {
    /**
     * @Description: 目标方法执行之前
     * @Author: ChenYao
     * @param:
     * @return:
     * @throws:
     * @CreateDate: 2018/6/26 14:34
     * @see:
     * Note:
     */

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if (user == null) {
            //未登录,返回到登录页面
            request.setAttribute("msg", "请先登录");
            request.getRequestDispatcher("login.html").forward(request, response);
            return false;
        } else {
            //已登录,放行
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
